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Behavior of the Blade Tip Vortices of a Wind Turbine Equipped with a Brimmed-Diffuser Shroud

Author

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  • Shuhei Takahashi

    (Department of Aeronautics and Astronautics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan)

  • Yuya Hata

    (Department of Aeronautics and Astronautics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan)

  • Yuji Ohya

    (Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan)

  • Takashi Karasudani

    (Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan)

  • Takanori Uchida

    (Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan)

Abstract

To clarify the behavior of the blade tip vortices of a wind turbine equipped with a brimmed-diffuser shroud, called a “Wind-Lens turbine”, we conducted a three-dimensional numerical simulation using a large eddy simulation (LES). Since this unique wind turbine consists of not only rotating blades but also a diffuser shroud with a broad-ring brim at the exit periphery, the flow field around the turbine is highly complex and unsteady. Previously, our research group conducted numerical simulations using an actuator-disc approximation, in which the rotating blades were simply modeled as an external force on the fluid. Therefore, the detailed flow patterns around the rotating blades and the shroud, including the blade tip vortices, could not be simulated. Instead of an actuator-disc approximation, we used a moving boundary technique in the present CFD simulation to simulate the flow around a rotating blade in order to focus especially on blade tip vortices. The simulation results showed a pair of vortices consisting of a blade tip vortex and a counter-rotating vortex which was generated between the blade tip and the inner surface of the diffuser. Since these vortices interacted with each other, the blade tip vortex was weakened by the counter-rotating vortex. The results showed good agreement with past wind tunnel experiments.

Suggested Citation

  • Shuhei Takahashi & Yuya Hata & Yuji Ohya & Takashi Karasudani & Takanori Uchida, 2012. "Behavior of the Blade Tip Vortices of a Wind Turbine Equipped with a Brimmed-Diffuser Shroud," Energies, MDPI, vol. 5(12), pages 1-14, December.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:12:p:5229-5242:d:22189
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    References listed on IDEAS

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    1. Yuji Ohya & Takashi Karasudani, 2010. "A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology," Energies, MDPI, vol. 3(4), pages 1-16, March.
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    Cited by:

    1. Nunes, Matheus M. & Brasil Junior, Antonio C.P. & Oliveira, Taygoara F., 2020. "Systematic review of diffuser-augmented horizontal-axis turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    2. Rahmatian, Mohammad Ali & Hashemi Tari, Pooyan & Mojaddam, Mohammad & Majidi, Sahand, 2022. "Numerical and experimental study of the ducted diffuser effect on improving the aerodynamic performance of a micro horizontal axis wind turbine," Energy, Elsevier, vol. 245(C).
    3. Khamlaj, Tariq Abdulsalam & Rumpfkeil, Markus Peer, 2018. "Analysis and optimization of ducted wind turbines," Energy, Elsevier, vol. 162(C), pages 1234-1252.
    4. Sridhar, Surya & Zuber, Mohammad & B., Satish Shenoy & Kumar, Amit & Ng, Eddie Y.K. & Radhakrishnan, Jayakrishnan, 2022. "Aerodynamic comparison of slotted and non-slotted diffuser casings for Diffuser Augmented Wind Turbines (DAWT)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).
    5. Leloudas, Stavros N. & Lygidakis, Georgios N. & Eskantar, Alexandros I. & Nikolos, Ioannis K., 2020. "A robust methodology for the design optimization of diffuser augmented wind turbine shrouds," Renewable Energy, Elsevier, vol. 150(C), pages 722-742.
    6. Ye, Xuemin & Zhang, Jiankun & Li, Chunxi, 2017. "Effect of blade tip pattern on performance of a twin-stage variable-pitch axial fan," Energy, Elsevier, vol. 126(C), pages 535-563.
    7. Ahmad I. Elshamy & Engy Elshazly & Olugbenga Timo Oladinrin & Muhammad Qasim Rana & Rasha Said Abd el-Lateef & Seif Tarek El-Badry & Mahmoud Elthakaby & Ahmed M. R. Elbaz & Khaled Dewidar & Iman El-Ma, 2022. "Challenges and Opportunities for Integrating RE Systems in Egyptian Building Stocks," Energies, MDPI, vol. 15(23), pages 1-23, November.
    8. Koichi Watanabe & Yuji Ohya, 2021. "A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser," Energies, MDPI, vol. 14(12), pages 1-15, June.
    9. Lipian, Michal & Dobrev, Ivan & Massouh, Fawaz & Jozwik, Krzysztof, 2020. "Small wind turbine augmentation: Numerical investigations of shrouded- and twin-rotor wind turbines," Energy, Elsevier, vol. 201(C).
    10. Koichi Watanabe & Yuji Ohya & Takanori Uchida, 2019. "Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct," Energies, MDPI, vol. 12(16), pages 1-17, August.
    11. Wang, Wen-Xue & Matsubara, Terutake & Hu, Junfeng & Odahara, Satoru & Nagai, Tomoyuki & Karasutani, Takashi & Ohya, Yuji, 2015. "Experimental investigation into the influence of the flanged diffuser on the dynamic behavior of CFRP blade of a shrouded wind turbine," Renewable Energy, Elsevier, vol. 78(C), pages 386-397.
    12. Rivarolo, M. & Freda, A. & Traverso, A., 2020. "Test campaign and application of a small-scale ducted wind turbine with analysis of yaw angle influence," Applied Energy, Elsevier, vol. 279(C).
    13. Ye, Xuemin & Li, Pengmin & Li, Chunxi & Ding, Xueliang, 2015. "Numerical investigation of blade tip grooving effect on performance and dynamics of an axial flow fan," Energy, Elsevier, vol. 82(C), pages 556-569.
    14. Silva, Paulo A.S.F. & Tsoutsanis, Panagiotis & Vaz, Jerson R.P. & Macias, Marianela M., 2024. "A comprehensive CFD investigation of tip vortex trajectory in shrouded wind turbines using compressible RANS solver," Energy, Elsevier, vol. 294(C).
    15. Rahmatian, Mohammad Ali & Nazarian Shahrbabaki, Amin & Moeini, Seyed Peyman, 2023. "Single-objective optimization design of convergent-divergent ducts of ducted wind turbine using RSM and GA, to increase power coefficient of a small-scale horizontal axis wind turbine," Energy, Elsevier, vol. 269(C).

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